NTSB Identification: CHI86FER01.
The docket is stored on NTSB microfiche number 31571.
Accident occurred Thursday, March 13, 1986 in WILLIAMS, MN
Aircraft: CESSNA 172H, registration: N3706R
Injuries: 1 Serious,3 Minor.

NTSB investigators either traveled in support of this investigation or conducted a significant amount of investigative work without any travel, and used data obtained from various sources to prepare this aircraft accident report.

THE PLT MADE A LOW PASS OVER A FROZEN, SNOW COVERED LAKE, THEN INTENDED TO MAKE A CLIMBING LEFT TURN. HE RPRTD THE WX & LIGHT CONDS AS 'SLIGHT HAZE, POOR HORIZON VISIBILITY, VERY WHITE OUT.' AS THE PLT CONTD WITH WHAT HE THOUGHT WAS A CLIMBING TURN, THE ACFT ENTERED A DSCNT & IMPACTED THE FROZEN LAKE. IN REFERENCE TO THIS ACCIDENT, THE PLT STATED THAT DURING HAZY CONDITIONS, SUNGLASSES THAT ARE LIGHTLY SHADED ON THE BOTTOM & DARK AT THE TOP CAN 'HELP CONFUSE THE HORIZON.'

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

CLEARANCE..MISJUDGED..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

DESCENT..INADVERTENT..PILOT IN COMMAND




Contributing Factors

WEATHER CONDITION..HAZE/SMOKE


Contributing Factors

TERRAIN CONDITION..SNOW COVERED


Contributing Factors

VISUAL/AURAL PERCEPTION..PILOT IN COMMAND


Contributing Factors

SPATIAL DISORIENTATION..PILOT IN COMMAND


Contributing Factors

LACK OF RECENT EXPERIENCE..PILOT IN COMMAND

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